PBDB Timescale

Ordovician of Britain

The interval definitions in this timescale are derived from the following sources:

F. M. Gradstein, J. G. Ogg, M. D. Schmitz and G. M. Ogg. 2020. Geologic Time Scale 2020 view
W. B. Harland, R. L. Armstrong, A. V. Cox, L. E. Craig, A. G. Smith and D. G. Smith. 1990. A Geologic Time Scale 1989. view
B. D. Webby. 1998. Steps toward a global standard for Ordovician stratigraphy. Newsletters in Stratigraphy 36:1-33 view
F. M. Gradstein, J. G. Ogg, and A. G. Smith. 2004. A Geologic Time Scale 2004 1-589 view

There are 14 timescales which overlap this one. show

Interval boundaries marked with * have been interpolated based on the differences between the ages for international timescale boundaries quoted in the source and the currently accepted ages for those boundaries.

Interval names marked with † are no longer in current use.

This timescale is used in the definition of 4547 collections

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International Chronostratigraphic Timescale			Ordovician of Britain				Ordovician of the Baltic				Cambrian Epochs	Cambrian of Britain
Ordovician	Late Ordovician	Hirnantian	Ashgill	Hirnantian			Harju	Porkuni						443.8
		Katian		Rawtheyan				Pirgu						445.2
				Cautleyan										448.9 *
				Pusgillian										449.3 *
			Caradoc	Streffordian	Onnian †			Vormsi						449.6 *
								Nabala	Johvi †					450 *
							Viru	Rakvere						450.6 *
				Cheneyan				Rakvere						451.5 *
				Cheneyan				Oandu						452 *
				Burrellian				Oandu						452.7 *
		Sandbian						Keila	Idavere †					453
					Actonian †			Keila						453.2 *
					Actonian †			Haljala						453.9
					Marshbrookian †	Woolstonian †								454.2 *
					Longvillian †									455.2 *
								Kukruse						456.4 *
				Aurelucian										456.8 *
					Soudleyan †/Harnagian/Costonian									457.4 *
					Soudleyan †/Harnagian/Costonian			Uhaku	Aluoja †					457.5 *
	Middle Ordovician	Darriwilian	Llanvirn	Llandeilian/Llandeilo/Late Llandeilo/Middle Llandeilo/Early Llandeilo/Late Llanvirn				Uhaku						458.4
								Lasnamagi						458.9 *
								Aseri						460.4 *
				Abereiddian/Early Llanvirn				Aseri						461.3 *
							Oeland	Kunda						462.9 *
								Kunda	Valaste †/Hunderum					464.3 *
								Volkhov		Langevoja †/Vaana/Saka				467.1 *
		Dapingian												467.3
			Arenig	Fennian										468.4 *
								Billingen						469.3 *
	Early Ordovician	Floian												470
									Latorp †					470.1 *
				Whitlandian										471.1 *
				Whitlandian				Hunneberg						473.7 *
				Moridunian										474.3 *
		Tremadocian	Tremadoc	Migneintian										477.7
				Cressagian										480.8 *
								Varangu						481.3 *
								Pakerort						482.2 *
														485 *
Cambrian	Furongian	Stage 10									Late Cambrian	Merioneth	Dolgellian/Trempealeauan	485.4
														486.3 *
														486.5
													Festiniogian	489.2 *
		Jiangshanian											Festiniogian	489.5
		Jiangshanian											Maentwrogian	493.1 *
		Paibian											Maentwrogian	494
	Miaolingian	Guzhangian									Middle Cambrian	St Davids		497
		Drumian												500.5
		Wuliuan												504.5
	Series 2	Stage 4									Early Cambrian	Caerfai		509
	Series 2	Stage 3												514
	Terreneuvian	Stage 2												521
	Terreneuvian	Fortunian												529
														538.8